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CAIE A-Level Chemistry AS 22.1.1 Analyse an Infrared Spectrum of a Simple Questions

Practise CAIE 9701 infrared spectra by matching wavenumber ranges to bonds, confirming functional groups and comparing peaks between compounds.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • read each marked wavenumber and match it to the data-table range before assigning a bond
  • support a functional-group claim with all required peaks, such as ester C=O and C–O absorptions
  • compare expected and observed peaks to assess purity or distinguish candidate molecular structures

CAIE A-Level Chemistry AS 22.1.1 Analyse an Infrared Spectrum of a Simple Questions question 1

[Maximum number: 1]

A sample of but-2-enoic acid, CH3CH=CHCOOH\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCOOH}, is analysed using infrared spectroscopy.
The infrared spectrum shows a broad peak in the range 2500−3000 cm−12500-3000 \mathrm{~cm}^{-1}.

Table for Question CAIE A-Level Chemistry AS 22.1.1 Analyse an Infrared Spectrum of a Simple Questions question 1 — CAIE A-Level Chemistry AS

Which bond is responsible for this peak?

A

C=C

B

C=O

C

C-O

D

O-H

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